Siri not working after iOS 7 update

Several people have been reporting Siri problems after updating to iOS 7 on iOS devices, iPads, iPhones and iPods. More specifically, users reported problems are:

Siri settings gone/missing

Siri not talking/listening/understanding

Siri not available

Siri says, “Sorry, I’m having trouble connecting to the network” or “try again in a little while”.

If you are experiencing Siri problems on iOS devices running iOS 7, here is how to resolve your issues. Please after performing each step, check to see if the issue is resolved:

1.Please make sure that your iPad or iPhone is connected to the Internet using cellular data or Wi-Fi.. If you are having network issues, troubleshoot your connection. You may want to Reset Network Settings, by tapping Settings > General > Reset > Reset Network Settings.

2.Tap Settings > General > Siri and make sure that Siri is ON.

3.Restart your device.

4.Disable Siri, turn off your device for a few minutes and turn back on, re-enable Siri by tapping Settings > General > Siri.

5.Reset your device by holding down the home button and the power button until you see the Apple logo.

I have IPhone 4s,updated to IOS7–using up my battery juice real fast.
I also have Sprint.If I turned off WIFI connection to save battery,SIRI would not work.I tried everything as outlined above and still not work until I turned back on WIFI.
Hope this helps.